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    <script>
      // 将数组 ['red', 'green', 'blue', 'pink', 'purple']
      // 1.声明一个型数组 newArr
      // 2.把旧数组索引号第4个取过来(arr.length - 1),给数组索引号第0个元素 (newArr.length)
      // 3.我们采取 递减的方式 i--
      var arr = ['red', 'green', 'blue', 'pink', 'purple']
      var newArr = []
      for (var i = arr.length - 1; i >= 0; i--) {
        newArr[newArr.length] = arr[i]
      }
      console.log(newArr)
    </script>
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